/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.diting.collections;

import java.util.*;
/**
 * Implements a comparator for reversing specified comparator's comparison result.
 * @author Bin Zhang
 *
 * @param <T> The  type to compare
 */
public class ReverseComparator<T> implements  Comparator<T>{

	/**
	 * Create a new ReverseComparator<T> using specified inner comparator
	 * @param comparator the original comparator
	 */
	public ReverseComparator(Comparator<T> comparator)
	{
		this._comparator = comparator;
	}
	
	/**
	 * Create a new ReverseComparator<T> using <NaturalComparator>
	
	 */
	public ReverseComparator()
	{
		this._comparator = new NaturalComparator<T>();
	}
	
	private Comparator<T> _comparator;
	
	@Override
	public int compare(T o1, T o2) {
		return -1 * this._comparator.compare(o1, o2);
	}

}
